Abstract
Ceratomyxa mennani n. sp. is a new coelozoic Ceratomyxa species found in the gallbladder of Epinephelus marginatus from the Gulf of Tunis, Tunisia. Mature plasmodia were disporic, ovoid in shape measuring 9–12 μm in width and 11–14 μm in length. Mature myxospores were slightly crescent-shaped with almost straight posterior margin, measuring 5.8 ± 0.2 (5.4–6.1) μm in length and 12.7 ± 0.3 (11.9–13.0) μm in thickness. The two valves were unequal with rounded ends. Polar capsules were spherical, equal in size with 2.1 ± 0.2 (1.9–2.6) μm in diameter. The binucleated sporoplasm filled the entire cavity of the myxospore. Molecular analysis of SSU rDNA sequences indicated that C. mennani n. sp. was distinct from all other Ceratomyxa sequences in GenBank. Phylogenetic analysis revealed that C. mennani n. sp. clustered with Ceratomyxa species infecting Epinephelinae fishes. Seasonal prevalence of infection over one year was significantly higher in winter and the lowest in autumn. This is the third report of Ceratomyxa species infecting the gallbladder of Epinephelus marginatus from Tunisia and the first study to include molecular data.
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Acknowledgments
This work is a part of the PhD thesis of Khouloud Bouderbala supported by the University of Tunis El Manar and in part by the Portuguese Strategic Founding Program UID/Multi/04423/2019 to CIIMAR (Interdisciplinary Centre of Marine and Environmental Research).
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Bouderbala, K., Rangel, L.F., Santos, M.J. et al. Ceratomyxa mennani n. sp. (Myxosporea: Bivalvulida) parasitizing the gallbladder of the dusky grouper Epinephelus marginatus (Serranidae) from Tunisian waters. Parasitol Res 119, 1515–1522 (2020). https://doi.org/10.1007/s00436-020-06649-9
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DOI: https://doi.org/10.1007/s00436-020-06649-9